TI994/A Power Supply

allison allisonportable at gmail.com
Fri Nov 15 07:20:35 CST 2019

On 11/15/19 7:46 AM, Jules Richardson via cctalk wrote:
> On 11/14/19 3:02 PM, Jules Richardson via cctalk wrote:
>>> I'm about 95% certain that it does NOT take line voltage in.
>> Hmm, I'll see if I can find a moment to take it apart later. It's
>> interesting that it's a boxed unit with a cord that fits - but then it
>> does have three broken keys (caps are kicking around in the box) so
>> it's entirely possible that someone just parked it there for storage.
> OK, the cord "fits", but having looked at it now I'm not at all
> convinced, either. The two-pin socket is actually the same as the
> four-pin socket on the other two machines, but with the upper two pins
> (intentionally) missing.
> The PSU board inside appears to be a switcher, but I'd be inclined to
> agree with Allison that it's intended to run from low-voltage AC (I've
> put the machine back together now, but just realized that I should have
> checked the voltage rating on the rectifier stage's caps).

Your inclined to agree, seriously.

I have at least one of every model and have run them periodically for
the games, refresh the media (tape and disks) and also because its
collection.  I have all the available documents including user and
service manuals.  I've even gone as far as to make a hybrid high
speed system with 16bit wide memory.  When you have excess a few
hacked for fun.  FOor those that gasp and clutch their chest I use
the black model as they are common as house flies.  The base early
99/4 and the late beige model are uncommon.

That and ratshack used to sell the switcher, transformer, keyboard
after TI quit and parted out their stock.  I have a few of all.


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